Lean-to conservatories
A lean-to conservatory has a single sloping roof that runs up to the wall of the house. It is the simplest shape to build, which makes it the cheapest style, and it fits under a window sill or an eaves line where a bay-fronted design would not.
Who lean-to conservatories suit
Suits
- Bungalows and houses with low eaves
- Narrow gardens and tight plots
- Anyone who wants the most space for the least money
Good points
- The lowest price of any style
- Simple roof, so fewer places to leak
- Works on small and awkward footprints
- Quick to build
Watch out for
- Plainer looking than a Victorian or Edwardian front
- The low roof pitch can feel less airy inside
- Less choice of roof lanterns and decorative ridges
What lean-to conservatories cost
Lean-to conservatories typically cost £8,300 (3m × 4m lean-to conservatory in uPVC, fitted), with most jobs between £6,000 and £10,500. That includes VAT at 20%. Fitting takes 15–30 days on site.
What you would actually pay
Typical 3m × 4m lean-to conservatory in uPVC, fitted · UK- Typical installed cost Lean-to conservatories, supplied and fitted
- £6,917
- VAT at 20% Standard rate
- £1,383
- Net cost to you
- £8,300
If you borrowed £8,300.00 over 36 months at 0.0%, it would cost £230.56 a month – £8,300.00 in total, of which £0.00 is interest. The last payment would be £230.40.
Illustration only – not a quote, not an offer of credit, and not financial advice. Rates depend on your circumstances and creditworthiness.
Where the money goes on lean-to conservatories
| Element | Typical range |
|---|---|
| Frame, glazing, roof and fitting uPVC frames, double glazed units and a polycarbonate roof, fitted on a standard concrete base. This row is the headline price and covers the whole range for the size shown. | £6,000 – £10,500 |
| Glass roof instead of polycarbonate An upgrade from a polycarbonate roof to A-rated glass. Optional, and priced against the standard roof. | £1,500 – £2,500 |
| Solid or tiled roof instead of polycarbonate A warm roof in place of a polycarbonate one, for a conservatory you want to use all year. Optional. | £4,000 – £8,000 |
| Groundworks on sloping or poor ground Extra digging and a deeper base where the site needs it. Many gardens need none. | £0 – £3,000 |
Guide prices including VAT. Your actual cost depends on your home, access and specification.
What moves the price of lean-to conservatories
- Size
Floor area is the biggest single driver. A larger footprint means more frame, more glass and a bigger base, though the price per square metre falls as the conservatory grows.
- Roof
Polycarbonate is the cheapest roof, glass costs more and a solid tiled roof costs the most. The roof is often the biggest difference between two quotes for the same shape.
- Frame material
uPVC is the base price. Aluminium and hardwood both cost more, and hardwood costs the most.
- The site
Sloping ground, poor soil, drains in the way and awkward access all push the price up before any frame goes in.
- Who builds it
National brands usually quote well above local FENSA or CERTASS installers for a similar specification. Compare like for like on frame, roof, base and guarantee.
What a quote for lean-to conservatories should include
If a quote is missing any of these, ask why before you compare it with another.
- The footprint, the style and the roof type, with a drawing that shows the layout
- The frame material and colour, inside and out, and the guarantee on frames, glass and the roof
- The base and groundworks: what is included, and what happens if the ground is poor
- Whether a dwarf wall is in brick or in the frame, and who builds it
- Building Regulations and planning: who checks whether you need them and who pays any fees
- Electrics, heating, flooring and blinds, and whether any of them are in the price
- FENSA or CERTASS registration for the windows and doors, and the deposit and payment schedule
Lean-to conservatories prices by region
Labour is most of the difference. Typical price (3m × 4m lean-to conservatory in uPVC, fitted), including VAT.
| Region | Typical | vs UK average |
|---|---|---|
| London | £10,500 | +25% |
| South East | £9,700 | +17% |
| South West | £9,100 | +10% |
| East of England | £8,800 | +6% |
| West Midlands | £8,600 | +4% |
| Scotland | £8,400 | +2% |
| East Midlands | £8,300 | UK average |
| Yorkshire and the Humber | £8,300 | UK average |
| North West | £8,100 | −2% |
| North East | £7,900 | −5% |
| Wales | £7,800 | −6% |
| Northern Ireland | £7,300 | −12% |
Common questions about lean-to conservatories
Is a lean-to the cheapest conservatory?
Yes. The roof is a single slope and the frame has few corners, so it takes less material and less labour than any other shape of the same size.
Can a lean-to have a solid roof?
Yes. A lightweight tiled roof suits the single pitch well, and it makes the room usable in winter and summer. It costs a lot more than polycarbonate or glass.
Do I need planning permission for a lean-to conservatory?
Most are permitted development, but limits on depth, height and how close it sits to a boundary apply. Check the rules for your nation and your property before you order.
Where these lean-to conservatories prices come from
Guide prices are compiled from published UK price guides, converted to a price before VAT, and shown here with VAT added. They are indicative, not quotations. How we price explains the method.
Get quotes for your home
A guide price only takes you so far. Local firms can price the work on your own home, and comparing a few quotes is the quickest way to see what is reasonable.
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